Motor vehicle comprising an occupant restraint device
View Patent ↗A motor vehicle with an occupant restraint device, including a control device which produces a triggering signal when a predefined hazard signal is generated as a function of signals of a safety sensor system, and, accordingly, the occupant restraint vehicle acts on a vehicle occupant by at least one impact cushion. The control device generates the hazard signal at least as a function of vehicle acceleration signals and a belt state signal representing the activation or deactivation of a seat belt, deactivating the occupant restraint device at least for a certain period of time and/or activating the occupant restraint device at reduced power if the seat belt is identified as having been deactivated and vehicle acceleration signals are assigned to a critical forward displacement of the occupant if the seat belt is deactivated.
1. A motor vehicle comprising:
an occupant restraint device, including a control device that produces a triggering signal when a predefined hazard signal is generated as a function of signals from a safety sensor system, the occupant restraint device configured to act on a vehicle occupant by at least one impact cushion; wherein,
the control device is configured to generate the hazard signal at least as a function of vehicle acceleration signals and a belt state signal representing activation or deactivation of a seat belt;
the control device deactivates the occupant restraint device for a predetermined period of time or activates the occupant restraint device at reduced power if the seat belt is identified as having been deactivated;
first vehicle acceleration signals are assigned to a critical forward displacement of the occupant if the seat belt is deactivated; and
a forward displacement of the occupant is defined as critical when a forward displacement travel, which is calculated from the vehicle acceleration signals and an effective duration of the forward displacement travel, is greater than a threshold of the forward displacement travel.
2. The motor vehicle as claimed in claim 1 , wherein the control device evaluates a deceleration magnitude, which is determined via a longitudinal acceleration sensor, as a first vehicle acceleration signal.
3. The motor vehicle as claimed in claim 2 , wherein the control device determines a resulting deceleration magnitude from the deceleration magnitude determined via the longitudinal acceleration sensor and a deceleration magnitude determined via a transverse acceleration sensor, and evaluates the resulting deceleration magnitude as a second vehicle acceleration signal.
4. The motor vehicle as claimed in claim 1 , wherein the control device evaluates a deceleration magnitude, which is determined via a transverse acceleration sensor, as a first vehicle acceleration signal.
5. The motor vehicle as claimed in claim 4 , wherein the control device determines a resulting deceleration magnitude from the deceleration magnitude determined via the longitudinal acceleration sensor and a deceleration magnitude determined via a transverse acceleration sensor, and evaluates the resulting deceleration magnitude as a second vehicle acceleration signal.
6. The motor vehicle as claimed in claim 1 , wherein the control device evaluates a deceleration magnitude, which is determined via the vehicle speed in the longitudinal direction of the vehicle, as a first vehicle acceleration signal.
7. The motor vehicle as claimed in claim 6 , wherein signals from wheel rotational speed sensors that represent the vehicle speed are output to the control device.
8. The motor vehicle as claimed in claim 1 , wherein the control device evaluates an effective duration of the vehicle acceleration signals.
9. The motor vehicle as claimed in claim 1 , wherein the threshold of the forward displacement travel is defined as a function of the distance between a maximum rearward position of a vehicle seat and one of a dashboard compartment covering and a glove compartment covering.
10. The motor vehicle as claimed in claim 1 , wherein the impact cushion is a deployable airbag.
11. The motor vehicle as claimed in claim 10 , wherein the airbag is deployable in at least two stages, with the control device outputting a signal to trigger a first stage if the seat belt is identified as having been deactivated and if the vehicle acceleration signals are assigned to a critical forward displacement of the occupant.
12. The motor vehicle as claimed in claim 1 , wherein the impact cushion is formed by an extendable cushion element arranged in the region of one of a dashboard compartment covering and a glove compartment covering.
13. The motor vehicle as claimed in claim 1 , wherein the occupant restraint device is assigned to a passenger seat.
14. The motor vehicle as claimed in claim 1 , wherein, in order to generate the hazard signal, the control device evaluates the vehicle acceleration signals in terms of magnitude and temporal profile in a pre-crash phase preceding a vehicle impact.
15. The motor vehicle as claimed in claim 14 , wherein the control device evaluates a deceleration magnitude, which is determined via a longitudinal acceleration sensor, as a first vehicle acceleration signal.
16. The motor vehicle as claimed in claim 14 , wherein the control device evaluates a deceleration magnitude, which is determined via a transverse acceleration sensor, as a first vehicle acceleration signal.
17. The motor vehicle as claimed in claim 14 , wherein the control device evaluates a deceleration magnitude, which is determined via the vehicle speed in the longitudinal direction of the vehicle, as a first vehicle acceleration signal.
18. The motor vehicle as claimed in claim 14 , wherein the control device evaluates an effective duration of the vehicle acceleration signals.
19. The motor vehicle as claimed in claim 14 , wherein the threshold of the forward displacement travel is defined as a function of the distance between a maximum rearward position of a vehicle seat and one of a dashboard compartment covering and a glove compartment covering.
20. A method for controlling an occupant restraint device in a motor vehicle, the method comprising:
producing a triggering signal from a control device, if a predefined hazard signal is generated as a function of signals of a safety sensor system, the hazard signal being generated at least as a function of vehicle acceleration signals and a belt state signal representing activation or deactivation of a seat belt;
acting on a vehicle occupant by at least one impact cushion of the occupant restraint device, based on the triggering signal;
deactivating the occupant restraint device for a predetermined period of time or activating the occupant restraint device at reduced power, if the seat belt is identified as having been deactivated; and
assigning first vehicle acceleration signals to a critical forward displacement of the occupant, if the seat belt is deactivated,
wherein a forward displacement of the occupant is defined as critical when a forward displacement travel, which is calculated from the vehicle acceleration signals and an effective duration of the forward displacement travel, is greater than a threshold of the forward displacement travel.